Earlier quoted context omitted.
I looked at the 16GB RAM, 512GB SSD, Skylake variant of the XPS 13. Amazing looking machine, fits my filter criteria of "has service manual available to mortals" except for one problem - Dell won't sell me one, and neither will Microsoft (Signature Edition). They only seem to be available in the US and even if I was willing to spend the nearly $4000AUD to import one they won't ship to a non-US address.
Several of the best Dell laptops are sold here in Australia with a considerable markup, even allowing for exchange rate. I tried to buy an XPS variant which was considered a 'workstation' for Australian Dell and so had an exorbitant markup which I'm not willing to pay. Hopefully things have improved now.
My issue is that the variant isn't available at all.